Draft-regulator.



No. 688,l95. Patented Dec. 3,1901.- J. H. PEA'RSUN.

DRAFT REGULATOR.

[Application led Apr. 16, 1901. (No Model.) 2 Sheets-Sheet I.

No. 688,|95. Patented Dec. 3, i901. J. H. PEARSON.

DRAFT REGULATOR.

(Applicatin filed Apr. 18, 1901.) (No Model.) 2 Sheets-Sheet 2.

G Hoz" mad TNS Nonms PETERS oo, mocruwo., WASHINGTON, r@4 r:`

NrTED STATES Prfrmwr OFFICE.

JAMES H. PEARSON, OF WORTHINGTON, INDIANA.

DRAFT-REG U LATO R.

SPECIFICATION forming part of Letters Patent 1\T o. 688,195, datedDecember 3, 1901. Application filed April 16,1901. Serial No. 56,124.(No model.)

construction for automatically regulating the' draft of steam-boilerfurnaces, accelerating the draft when the fire is slow, and retardingthe draft when the fire is too brisk and the pressure of steam in excessof a given point.

For a full description of the invention and the merits thereof and alsoto acquire aknowledge of the details of construction of the means foreffecting the result reference is to be had to the following descriptionand drawings hereto attached.

Vhile the essential and characteristic features of the invention arenecessarily susceptible of modification, still the preferred embodimentof the invention is illustrated in the accompanying drawings, in which-Figure 1 is a detail view in elevation, showing the application of theinvention. Fig. 2 is a sectional detail, on a larger scale, showing thenormal position of the parts when the npdraft-valve is open, the arrowsindicating the direction of the steam to increase the draft through thestack. Fig. 3 is a view similar to Fig. 2, the updraft-valve beingclosed. Fig. a is a view similar to Fig. 3, the main valve being openandl the arrows indicating the direction of the steam to retard thedraft through the stack. Fig. 5 is a horizontal section on the line X Xof Fig. 2. 6 is a perspective view of the divided outlo w pipe. Fig. 7is a detail section of the divided elbow and outflow-pipe connected.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

In its general construction the device conprises a casing, cooperatingvalves, and tension-sprin gs. The casing consists of a pipe 1, an elbow2, and a cup 3, the latter having a the cup 3 exterior to the valve-stem9.

Fig. f

threaded end 4, by means of which it is connected to the steam-boiler 5,to which the regulator is applied. The pipe 1 has its delivery endiitted to the smoke-stack 6 of the steamboiler furnace and projectedtherein a suitable distance, so as either to accelerate or retard thedraft as Vmay be required to maintain a predetermined pressure of steamwithin the boiler. The several parts l, 2, and 3 may be connected in anydesired way, and, as shown, they are coupled by the usual screwthreadjoints. The vertical branch of the elbow 2 is fitted into the upper endof the cup 3, thereby providing a shoulder 7 for the upper end of thespring 8 to obtain a purchase against, said spring being mounted uponthe stem 9 of the main valvelO and the lower end of the spring obtaininga bearing upon the outer portion of the valve 10 beyondV the sides ofthestem 9. This spring 8 serves normally to hold the valve 10 seatedagainst the boiler-pressure when not in excess of a given point,therebypreventing passage of the steam from the boiler by the valve 10 andthrough The valve 10 is of a diameter to fit snugly within the cup 3 andis formed in its edges with a series of grooves or channels 11,constituting passages for the outiiow of steam when the valve 10 isunseated. This valve closes downward against a seat 12, provided at thelower end of the cup 3, the tension of the spring 8 being regulated soas to prevent the unseating of said valve until the pressure of steamwithin the boiler exceeds a predetermined pressure.

The elbow 2 is subdivided, so as to providek chambers or passages 13 and14, which are in communication with corresponding passages 13a and 1&1aof the pipe 1. A partition 15 separates the`passages 13 and 14,and itsupper end extends above the lowermost wall ofthe horizontal branch ofthe elbow, so as to close the inner end of the passage 14;n of thepipe 1. The upper end of the valve-stem 9 snugly fits within the lowerportion of the passage 13, so as to prevent the escape of steam from thecup 3 into the passage 13 when the valve l0 is unseated. l

The pipe 1 will be designated as the outflow-pipe and may be of anyconstruction so IOC long as it comprises the passages 13 and 14, whichare in communication with the corresponding passages 13 and 14 of theintermediate portion of the casing. As shown,the pipe 1 is subdivided bya partition 16, and its outer end is closed by a header 17, and theinnerend of the passage 14a is :closed by a header 18, the inner end of thepassage 13a being open. Openings 19 and 2O are provided at the outer endof the outflow-pipe and -communicate with, respectively, the passages13a and 14a. An opening 2l is provided at the inner end of the pipeandis in communication with the passage 14. As hereinbefore stated, theouter end portion of the part l is adapted to be connected to the loweror base pol'tion of the stack 6 in any desired way, and the delivery endportion projects into said stack a suitable distance, so as to secureall the advantages of the invention with reference to accelerating andretarding the draft. When the parts 1 and 2 are assembled, the header 18abuts against the upper end portion of the partition 15, so as toprevent any steam from the passage 14 escaping into the upper portion ofthe 'elbow and entering the passage 13% The main valve lO and its stemare hollow or bored lto receive a Valve 22 and its stem 23, constitutingthe updraft-valve. The upper portion of the stem 23 is hollow or bored,

as shown at 24, to receive acoil-spring 25, by

means of which the valve 22 is normally held unseated, so as to permitthe free passage of steam thereby through the valve 10 and out throughthe passage 13 and up through the stack 6, so as to increase the draftafter the manner of a blower and twyer. The valve 22 when closed isseated within the lower face of the valve l0 and is prevented fromvertical displacement by means of a pin 26, supported lat its ends intransversely-ahmed openings of the stem 9 and passing through verticalslots 27 in diametrically opposite sides of the hollow portion of thevalve-stem 23. The coil-spring 25 is confined in the opening 24 by meansof the pin 26 and normally exerts a downward pressure upon the Valve 22to hold it unseated. The spring 25 is of less tension than the spring 8,so as to yield and permit of the seating of the updraft-valve while themain valve remains seated. 1

When in position, the lower portion of the .casing is connected to theshell of the boiler 5 and is in communication with the steamspacethereof and its opposite end is connected to the smoke-stack. The valve22 being open under normal conditions, the steam from the boiler passesthereby and through the main valve and into the stack by way of thepassage 13a and the opening 19, and being directed upward into the stackcreates a forced draft therethrough and through the furnace after themanner of a twyer, whereby the draft is greatly accelerated and the firecaused to burn briskly. The tension of the spring 25 may be set withreference to the area of the valve 22 so as to hold the latter openuntil the required steam-boiler pressure has been reached, when the saidspring will be compressed and the valve 22 closed,thereby shutting offthe j et of steam through the stack. When the steam in the boilerexceeds a predetermined pressure, it overcomes the tension of the spring8 and unseats the valve 10, when a portion of the steam will pass by thevalve 10 through the c'up 2, passages 14 14, and out through the opening20 into the stack 6, and being directed downward into said stack retardsthe draft therethrough and dampens the tire by choking off the drafttherethrough. When the steam falls to the required pressure, the spring8, regaining itself, closes the valve 10 and shuts olf the reverse blastin the stack and permits the fire to burn under natural draft, and whenthe steam-pressure falls below the standard the spring 25 will unseatthe valve 22 and again permit a forced updraft through the stack,whereby the lire is caused to burn more briskly and the steam generatedmore rapidly. When the steam-pressure is normal, the blast-creatingdevice is inert, and when the pressure exceeds or falls below a givenpoint a blast is created in the smoke-stack either in an upward ordownward direction to accelerate or retard the draft to meet eX- istingconditions.

Having thus described the invention, what is claimed as new is- 1. In adraft-regulator for steam-boiler'and other furnaces a casing adapted tobe connected with the stack and the steam-space of the boiler and havingpassages opening into said stack in an upward and a downward direction,and automatic valves for controlling the admission of steam into saidpassages, the valve which controls the passage opening upward in thestack being closed when a certain predetermined pressure in the boileris reached, and the Valve which controls the passage opening downward inthe stack being opened when there is an abnormal pressure in the boiler.

2. In a draft-regulator for steam-boiler and other furnaces, a casingadapted to be connected with the steam-space and the stack of thefurnace, said casing having passages opening upward and downward intothe said stack, coperating valves for controlling the said passages, anddierent-tensioned springs for holding the said valves in a normalposition, the valve for controlling the downdraft being normally seatedand the updraft-valve normally open, substantially as set forth.

3. In a draft-regulator, a casing having passagesopening in an upwardand a downward direction, and spring-actuated valves for controlling theadmission of steam into the said passages, the valve which controls thepassage opening upward being mounted within the valve which controls thepassage opening downward and normally unseated and adapted to be closedwhen a certain predetermined pressure in the boiler is reached, and thevalve IOC) IIO

IZO

which controls the passage opening downward being opened when there isan abnormal pressure in the boiler, substantially as set forth.

4. In a draft-regulator, a casing having passages opening in oppositedirections, a main valve normally seated and adapted to control thepassage of steam through the passage opening downward, and anupdraftvalve mounted within the main valve and normally unseated topermit of the escape of steam through the upwardly-opening passage andadapted to close by an excessive pressure of steam, substantially as setforth.

5. In a draft-regulator, a casing comprising approximatelyrightangularly-disposed members, the upper portion of the verticalmember and the horizontal member being partitioned to form correspondingintercom munieating passages which open upwardly and downwardly attheirdeliveryends,and springcontrolled concentric valves located in thevertical member of the casing for controlling the aforesaid passages,the valve which controls the passage opening upward being mounted withinthe valve which controls the passage opening downward and normallyunseated and adapted to be closed when a certain predetermined pressurein the boiler is reached, and the valve which controls the passageopening downward being opened when there is an abnormal pressure in theboiler, substantially as set forth.

6. A draft-regulator comprising a casing having passages opening inopposite directions, a main valve normally held seated and adapted tocontrol the passage of steam through the passage opening downward andhaving an opening therethrough, an updraftvalve mounted in the openingof the main valve for controlling the passage of steam therethrough tothe passage opening upward and having an opening in its upper end, andopposite slots, a spring fitted into the opening of the updraft-valve,and a pin for conning said spring and preventing displacement of theupdraft-valve by passing through the slots thereof and having its endssecured to the main valve, substantially as set forth.

7. A draft-regulator comprising a vertical member having its upperportion partitioned to form passages, a horizontal member havingpassages in communication with the respective passages of the verticalmember and having upper and lower outlets, the upper portion of thepartition of the vertical member overlapping the inner end of a passageof the horizon tal member, and concentric valves for controlling thepassage of steam through the said passages, the valve which controls thepassage opening upward being mounted within the valve which controls thepassage opening downward and normally unseated and adapted to be closedwhen a certain predetermined pressure in the boileris reached,y and thevalve which controls the passage opening downward being opened whenthere is an abnormal pressure in the boiler, substantially as set forth.

8. A draft-regulator comprising a cup, a partitioned outflow-pipe havingupper and lower outlets, a partitioned elbow connecting the cup andoutflow-pipe, a main valve 1ocated in the cup and adapted to control thepassage of steam through the passage opening downward and having atubular stem operating in the vertical branch of the elbow, a springnormally holding the main valve seated, an updrat't-valve slidinglymounted in the main valve and normally open, and adapted to control thepassage of steam therethrough to the passage opening upward, a springseated in the upper portion of the stem of the updraft-valve, and a pinfor preventing displacement of the updraft-valve and confining theactuating-springthereof, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES H. PEARSON. s] Vitnesses:

J As. E. WARD, y CHARLES WHITE.

